Welch Allyn Home™ Scale
Directions for use
901077 Weight scale, Software Version 1.0
© 2017 Welch Allyn. All rights are reserved. To support the intended use of the product described in this
publication, the purchaser of the product is permitted to copy this publication, for internal distribution
only, from the media provided byWelch Allyn. No other use, reproduction, or distribution of this
publication, or any part of it, is permitted without written permission from Welch Allyn.
Welch Allyn Home Scale is a trademark of Welch Allyn.
Welch Allyn assumes no responsibility for any injury to anyone, or for any illegal or improper use of the
product, that may result from failure to use this product in accordance with the instructions, cautions,
warnings, or statement of intended use published in this manual.
The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any
use of such marks by Welch Allyn is under license.
Software in this product is © 2017 Welch Allyn or its vendors. All rights are reserved. The software is
protected by United States of America copyright laws and international treaty provisions applicable
worldwide. Under such laws, the licensee is entitled to use the copy of the software incorporated with
this instrument as intended in the operation of the product in which it is embedded. The software may
not be copied, decompiled, reverse-engineered, disassembled, or otherwise reduced to humanperceivable form. This is not a sale of the software or any copy of the software; all right, title, and
ownership of the software remain with Welch Allyn or its vendors.
For information about any Welch Allyn product, contact your local Welch Allyn representative:
www.welchallynhome.com/support.htm.
726196
DIR 80021989 Ver. B Revised 2017–02
Manufactured for Welch Allyn, Inc.
4341 State Street Road
Skaneateles Falls, NY 13153 USA
www.welchallynhome.com
This manual applies to
901077 Weight scale.
iii
Contents
Introductory information ........................................................................ 1
Introduction .......................................................................................................... 1
Symbols ............................................................................................................... 1
About warnings and cautions ............................................................................... 3
Content list ........................................................................................................... 4
Controls and indicators ........................................................................................ 4
Screen elements .................................................................................................. 5
Use the scale ............................................................................................ 7
Startup ................................................................................................................. 7
Insert or replace the batteries .............................................................................. 7
Install the carpet feet ........................................................................................... 7
Pair a smartphone, a tablet, or a communication hub with the scale .................. 8
Select the measurement unit .............................................................................. 8
Ensure accurate measurements .......................................................................... 8
Obtain measurement ........................................................................................... 9
Stop a measurement ........................................................................................... 9
Maintain the scale ................................................................................................ 9
Troubleshooting .................................................................................................. 9
Appendices ............................................................................................ 13
Specifications ..................................................................................................... 13
General radio compliance ................................................................................... 14
Complied standards list ...................................................................................... 15
Emissions and immunity information ................................................................. 16
Warranty ............................................................................................................ 19
Approved accessories ........................................................................................ 20
iv
Contents
Welch Allyn Home™ Scale
1
Introductory information
Introduction
The Welch Allyn HomeTM Scale is intended for adults and children (10-17 years old) to
measure weight in a home environment.
This Directions for use contains important safety and care information and provides step
by step instructions for using the scale. Read the manual thoroughly before using the
scale.
For information about any Welch Allyn product, contact Welch Allyn Home technical
support at www.welchallynhome.com/support.htm.
Indications for use
The Welch Allyn Home Scale is intended for adults and children (10–17 years old) to
measure weight in the home.
Contraindications
This device is contraindicated for any person who is connected to a wearable or
implantable electronic device or instrument, such as a pacemaker or defibrillator.
Symbols
Documentation symbols
Warning: The warning statements in this manual identify conditions or practices that could lead to
illness, injury, or death. Warning symbols will appear with a grey background in a black and white
document.
Caution: The caution statements in this manual identify conditions or practices that could result in
damage to the equipment or other property, or loss of data.
Mandatory - Consult Directions for Use
2
Introductory information
Welch Allyn Home™ Scale
Power symbols
Direct current (DC)
Shipping, storing, and environment symbols
Humidity limitation
Separate collection of
Electrical and Electronic
Equipment. Do not
dispose as unsorted
municipal waste.
Temperature limit
Atmospheric pressure
limitation
Recycle
Stacking limit by number
Connectivity symbols
Bluetooth® wireless technology enabled
Miscellaneous symbols
IP22
Serial number
Manufacturer
Product identifier, product family catalogue number
Non-ionizing electromagnetic
radiation
Reorder number, Model number
Global Trade Item Number
The ingress protection: the device could protected against
solid foreign objects of 12.5mm and greater, and against
vertically falling water drops when ENCLOSURE tilted up
to 15°
Type BF applied parts
Directions for use
Introductory information
3
About warnings and cautions
Caution statements can appear on the Welch Allyn Home Scale device, packaging,
shipping container, or in this Directions for use.
The Welch Allyn Home Scale is safe for users when used in accordance with the
instructions and caution statements presented in this Directions for use.
Before using the device, you must familiarize yourself with all cautions, with the steps to
power up the device, and with the sections of this Directions for use that pertain to your
use of the device. In addition to reviewing the general cautions presented in the next
section, you must also review the more specific cautions that appear throughout the
manual in conjunction with setup/startup, operation, and maintenance tasks.
•
Failure to understand and observe any warning statement in this manual could lead
to injury or illness.
•
Failure to understand and observe any caution statement in this manual could lead to
damage to the equipment or other property, or loss of data.
General warnings and cautions
Warning Injury risk. Do not use the scale on a slippery floor, such as tile.
Warning Injury risk. Do not jump onto the platform immediately after
bathing or with wet hands.
Warning Injury risk. Dispose of accessories, detachable parts, and the
device according to the local guidelines.
Warning Injury risk. No modification of this equipment is allowed.
Modifying the equipment could damage the device or cause injury.
Warning Injury risk. Do not touch output of the batteries and the user
simultaneously.
Warning Injury risk. Before use, make sure the device functions safely and
is in proper working condition. Failure to do so could damage the device or
cause injury.
Warning Possible injury risk. The device contains small parts. Keep the
device away from children and pets.
CAUTION Avoid storing the device where the device may be exposed to
extreme temperatures, humidity, moisture, direct sunlight, dust, or salt air.
CAUTION Avoid storing the device where there is risk of shock or
dropping.
CAUTION Avoid storing the device where you store chemicals.
CAUTION Avoid storing the device where there are corrosive gases.
CAUTION Avoid storing the device near infants or children.
4
Introductory information
Welch Allyn Home™ Scale
CAUTION Do not attempt to repair the unit yourself in the event of
malfunctions. Only have repairs carried out by authorized service centers.
CAUTION Do not use rechargeable batteries.
CAUTION Use the scale in the environment described in this Directions
for use. Using the scale in other environments will compromise the
performance of the scale and reduce the lifetime of the scale.
Content list
The following items are in the device box:
•
Home Scale
•
(4) AAA alkaline batteries (1.5V each)
•
(4) extension feet for use on carpet
•
Directions for use
Controls and indicators
The Welch Allyn Home scale is simple to use.
Scale top
No. Feature
1
LCD display
Description
Displays measurement
Directions for use
Introductory information
No. Feature
Description
2
UNIT / Power button
The button enables you to select kg or lb unit measure. Press and
hold for 3 seconds to enter pairing mode.
3
Battery compartment (behind cover)
Houses (4) AAA alkaline batteries (1.5V each)
4
Sensors (4)
4 load cell sensors which conduct weight measurement
Screen elements
The liquid crystal display (LCD) display registers the measurement. The display also may
show other icons that provide information about the functionality of the scale.
Icon
Description
Icon
Description
kg
Kilogram
lb
Pound
Low battery charge
Full battery charge
Bluetooth wireless
technology is powered on
Bluetooth wireless technology
connected (dotted area is not
flashing)
Data being transferred
using Bluetooth wireless
technology (dotted area
flashes)
Scale not paired with device
5
6
Introductory information
Welch Allyn Home™ Scale
7
Use the scale
Startup
The Welch Allyn Home scale uses SENSE ON™ technology to turn on the scale. Step on
the scale with bare feet to begin a measurement.
Insert or replace the batteries
CAUTION When the
symbol appears, the device will power off
in four seconds. Replace the old batteries with a new set of four batteries.
Always replace all four batteries with new batteries. Do NOT mix old
batteries with new batteries.
CAUTION Remove the batteries if the device is not to be used for some
time.
CAUTION Dispose old batteries by following your local recycling
guidelines.
CAUTION Do not burn batteries. Batteries may leak or explode.
1. Open the battery door on the under side of the scale.
2. Insert the four AAA alkaline batteries (1.5V each) into the battery compartment
according to the polarity indications marked inside the battery compartment.
3. Close the battery door.
4. Wait until the digits “0.0lb”appear on the LCD screen.
Install the carpet feet
Install the carpet feet if you use the device on carpet to avoid the device slipping.
1. Peel off and removethe rubber stickers on the four corner posts.
2. Remove the four carpet feet from the packaging.
3. Insert the carpet feet prongs into the posts.
8
Use the scale
Welch Allyn Home™ Scale
Pair a smartphone, a tablet, or a communication hub with
the scale
Advanced Bluetooth 4.0 technology enables your smartphone, tablet, or a
communication hub to receive your personal health information from your device. You
have two alternatives to pair your device with these devices.
•
If you are using the Welch Allyn Home application, follow the pairing instructions
presented in the application.
•
Contact your Remote Monitoring Solution provider or use the instructions that office
provided to set up these communications devices.
With either alternative, you complete the same steps on the Home scale.
1. Confirm that both the smart device and the Home scale are powered on.
Note
Bluetooth wireless connectivity is only available for devices
which support Bluetooth 4.0 technology.
2. Press and hold the Unit / Power button on the bottom of the scale for 3 seconds.
The Bluetooth pairing sequence is activated. The dotted line surrounding the
Bluetooth symbol flashes while discovering the weight scale.
If successful, a steady
symbol surrounded by a dotted line appears on the scale's
LCD screen. If unsuccessful, the
appears.
Select the measurement unit
The default measurement unit is pound (lb).
Press the Unit / Power button on the bottom of the scale to change from pound (lb)
to kilogram (kg).
Ensure accurate measurements
To ensure the accuracy of measurements, follow the recommendations below when you
start a measurement.
•
Place the scale on a flat, hard surface for at least 10 seconds. Obtaining the
measurement immediately after placing the scale on a flat, hard surface may affect
the accuracy of the measurement.
•
If you place the scale on carpet, fit the extension feet before taking the
measurement. Placing the scale sensors directly on carpet may affect the accuracy
of the measurement.
•
Always start a measurement at the same time on the same scale located on the
same flat surface.
Directions for use
Use the scale
9
Obtain measurement
With the original SENSE ON patent technology, the scale automatically powers on when
you step on the platform in your bare feet.
1. Step on the platform in your bare feet.
The scale automatically powers on and begins the measurement.
2. Stand still and keep full contact with the scale until the LCD stops blinking and
displays the weight.
Stop a measurement
You can stop a measurement before it is complete.
Step off the platform.
The scale returns to a ready / zero state.
After approximately 2 seconds, the scale powers down automatically.
Maintain the scale
Warning Injury risk. Keep the device clean. Contact with a contaminated
device can spread infection. Clean the device after each use.
Note
The Home scale does not require calibration.
To get the best performance from your Home scale, follow the maintenance steps
below.
•
Store the device in a dry place away from direct sunlight.
•
Avoid shaking and dropping the device
•
Avoid operating the device in dusty and unstable temperature environments.
CAUTION Use a soft cloth to clean the entire device. Do not use any
abrasive or volatile cleaners.
The following agents are compatible with the device:
•
70 percent isopropyl alcohol
•
10 percent chlorine bleach/90 percent water solution
1. Clean the Home scale only when necessary with one of the compatible cleaning
agents listed above.
2. If necessary, wipe the device with a soft, damp cloth.
Troubleshooting
This section includes a list of error messages and frequently asked questions for
problems you may encounter with your Home scale. If the device is not operating as you
think it should, check here before arranging for servicing.
10
Use the scale
Welch Allyn Home™ Scale
Error prompt
Error
Description
Solution
Dotted lines
Overload. The device will power off
Weight exceeds scale maximum
Low Battery. The device will power off Replace all four batteries at the same
time. Purchase the authorized batteries
in four seconds.
for replacement.
Error condition
At any point, when a situation occurs
that prevents a successful test
acquisition, an error code will be
displayed in the LCD area. The
message will persist for several
seconds until the device times out and
powers down.
Check the following items:
• Bluetooth wireless technology is
on.
• The application is on.
• Both devices are within the
transmission distance of
Bluetooth devices.
E02
Movement while weighing
Remain motionless while weighing
Weight fluctuates
Placement on scale is improper
Place scale on hard ground, then weigh
again after returning scale to 0.0 kg.
Moved scale
Place scale on hard ground, then weigh
again after returning scale to 0.0 kg.
Cannot power on scale
Batteries inserted improperly
Move scale and insert batteries.
Reboot the scale and weigh again.
Scale halted
Electrostatic interference
Move scale and insert batteries.
Reboot the scale and weigh again.
Root cause
Solution
When measuring
Problem
No display on the LCD screen or display Batteries are not installed or not
flickers with the scale powers on
installed properly
Install the batteries. Go to "Insert or
replace the batteries"
Worn batteries
Replace all four batteries at the same
time. Purchase the authorized batteries
for replacement.
The scale powers off automatically
Low Battery.
Replace all four batteries at the same
time. Purchase the authorized batteries
for replacement.
"Bat" symbol appears for 3 seconds
then the scale powers off
No batteries
Replace all four batteries at the same
time. Purchase the authorized batteries
for replacement.
Measurement fluctuates by several
pounds from last measurement
Scale was not placed on a hard, flat
surface for at least 10 seconds before
obtaining measurement
Place the scale on a hard, flat surface
for at least 10 seconds before stepping
Directions for use
Use the scale
Problem
Root cause
Solution
onto the scale to begin the
measurement
When transmitting data
Problem
Root cause
Solution
Data transmission failed
Bluetooth wireless technology is off
Turn on the Bluetooth wireless
technology via the Settings.
Application is off
Press the icon to run your application.
Out of range of Bluetooth transmission. Place your mobile or portable device
closer to the scale.
11
12
Use the scale
Welch Allyn Home™ Scale
13
Appendices
Specifications
Warning: No modification of this equipment is allowed.
Item
Specification
Power supply
6V 4*AAA alkaline batteries
Display mode
Blue LCD with White Backlight V.A.: 74x53mm
Measurement unit
Kilogram / Pound
Measurement range
5kg to 200kg / 11lb to 441lb
Resolution
The measurement resolution
shall be:
0–100kg: 0.1kg
0–220 lb: 0.2lb
220–440lb: 0.5lb
100–200kg: 0.2kg
Normal working condition
Temperature: 5℃ (41°F) to 40℃ Humidity: ≤ 85%RH
(104°F)
Atmospheric pressure: 86kPa to 106kPa
Storage & transportation
condition
Temperature:-20℃ (-4°F) to 60℃ Relative Humidity: 10% RH–93% RH
(140°F)
Atmospheric Pressure: 50kPa to 106 kPa
Net Weight
Approximately 2.75kg (6.1 lb.) ( Excluding the dry cells)
Dimensions
360mm x 408mm x 32.5mm (14.2inches x16.1inches x 1.3inches) with carpet feet
Accessories
•
•
•
Mode of operation
Continuous operation
(4) AAA alkaline batteries
(4) extension feet
Directions for use
14
Appendices
Welch Allyn Home™ Scale
Item
Specification
Auto-ON
SENSE ON technology
Auto-OFF
About 15 seconds when showing 0.0
About 15 seconds after the weight data is locked
Degree of protection
Type BF applied part
Protection against ingress of
water
IP22
Software Version
Version 1.0
General radio compliance
Item
Specification
Bluetooth Module No.
AW51822
RF Frequency Range
2402 MHz to 2480 MHz
Output Power
4.0 dBm
Supply Voltage
1.8-3.6 V
Antenna Gain
0dBi
Transmitting Distance
10 meters, (30 feet)
Federal Communication Commission (FCC) Interference Statement
This device complies with part 15 of the FCC Rules. Operation is subject to the following
two conditions.
•This device may not cause harmful interference.
•This device must accept any interference received, including interference that may
cause undesired operation.
This equipment (FCC ID: OU9BS-1507) has been tested and found to comply with the
limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses, and can radiate radio frequency energy and,
if not installed and used in accordance with the instructions, may cause harmful
interference to radio communications. However, there is no guarantee that interference
will not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to correct the interference by one of
the following measures.
1.Reorient or relocate the receiving antenna.
2.Increase the separation between the equipment and receiver.
Directions for use
Appendices
15
3.Consult the dealer or an experienced radio/TV technician for help.
Any changes or modifications not expressly approved by the party responsible for
compliance could void the user's authority to operate this equipment.
FCC Radiation Exposure Statement
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled
environment. This transmitter must not be co-located or operating in conjunction with
any other antenna or transmitter.
Industry Canada (IC) compliance
This device complies with Industry Canada licence-exempt RSS standard(s). Operation is
subject to the following two conditions: (1) this device may not cause interference, and
(2) this device must accept any interference, including interference that may cause
undesired operation of the device.
Cet appareil est conforme aux normes RSS exemptes de licence de l'Industry Canada.
Son fonctionnement est soumis aux deux conditions suivantes : (1) l'appareil ne doit pas
produire de brouillage, et (2) l'appareil doit accepter tout brouillage radioélectrique subi,
même si le brouillage est susceptible d'en compromettre le fonctionnement.
This radio transmitter (IC: 12725A-BS1507) has been approved by Industry Canada to
operate with the antenna listed in the specification table.
Ce transmetteur de radio (C: 12725A-BS1507) a été approuvé par l'Industry Canada pour
fonctionner avec l'antenne répertoriée dans la table des spécifications.
This Class B digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe B est conforme à la norme NMB-003 du Canada.
Complied standards list
Item
Standard
Risk management
ISO/EN 14971 Medical devices — Application of risk
management to medical devices
Labeling
ISO/EN 15223-1 Medical devices. Symbols to be used with
medical device labels, labeling and information to be
supplied. General requirements
Tested in accordance with ISO 10993 Biocompatibility
User manual
EN 1041 Medical equipment manufacturers to provide
information
General Requirements for Safety
IEC 60601-1+A1 Medical electrical equipment - Part 1:
General requirements for basic safety and essential
performance
IEC 60601-1-11 Medical electrical equipment - Part 1-11:
General requirements for basic safety and essential
performance - Collateral standard: Requirements for
16
Appendices
Welch Allyn Home™ Scale
Item
Standard
medical electrical equipment and medical electrical
systems used in the home healthcare environment
Electromagnetic compatibility
IEC/EN 60601-1-2 Medical electrical equipment - Part 1-2:
General requirements for basic safety and essential
performance - Collateral standard: Electromagnetic
compatibility - Requirements and tests
Software life-cycle processes
IEC/EN 62304+AC Medical device software - Software life
cycle processes
Usability
IEC 62366 Medical devices - Application of usability
engineering to medical devices (IEC 62366)
IEC 60601-1-6 Medical electrical equipment - Part 1 -6 :
General requirements for basic safety and essential
performance - collateral standard : Usability
Emissions and immunity information
The Welch Allyn Home Scale RPM-SCALE100 is intended for use in the electromagnetic
environment specified below. The customer or user of the Welch Allyn Home Scale
should assure that it is used in such an environment.
This equipment needs to be installed and put into service in accordance with the
information provided in the user manual.
CAUTION Wireless communications equipment, such as wireless home
network devices, mobile phones, cordless telephones and their base
stations, walkie-talkie can affect this equipment and should be kept at least
a distance d=3,3m away from the equipment.
Note
As indicated in Table 6 of IEC 60601-1-2:2007 for ME Equipment, a typical
cell phone with a maximum output power of 2 W yields d=3,3m at an
IMMUNITY LEVEL of 3V/m).
Electromagnetic emissions
The Welch Allyn Home Scale is intended for use in the electromagnetic environment specified below. The customer or
user of the Welch Allyn Home Scale should assure that it is used in such an environment.
Emissions test
Compliance
Electromagnetic environment - guidance
RF emissions
CISPR 11
Group 1
The Welch Allyn Home Scale uses RF energy only for its internal
function. Therefore, its RF emissions are very low and are not likely to
cause any interference in nearby electronic equipment.
RF emissions
CISPR 11
Class B
Harmonic emissions
IEC 61000-3-2
Not applicable
The Welch Allyn Home Scale is suitable for use in all establishments
other than domestic establishments and those directly connected to the
public low-voltage power supply network that supplies buildings used
for domestic purposes.
Directions for use
Appendices
17
Electromagnetic emissions
Voltage fluctuations/
flicker emissions
IEC 61000-3-3
Not applicable
Electromagnetic immunity
The Welch Allyn Home Scale is intended for use in the electromagnetic environment specified below. The customer or
the user of the Welch Allyn Home Scale should assure that it is used in such an environment.
Immunity test
IEC 60601 test level
Electrostatic discharge ±6 kV contact
(ESD)
± 8 kV air
IEC 61000-4-2
Compliance level
Electromagnetic environment - guidance
± 6 kV contact
± 8 kV air
Floors should be wood, concrete or ceramic
tile. If floors are covered with synthetic
material, the relative humidity should be at
least 30%.
Electrical fast
transient/burst
IEC 61000-4-4
±2 kV for power supply ±2 kV for power supply Mains power quality should be that of a typical
lines
lines
commercial or hospital environment.
Surge
IEC 61000-4-5
± 1 kV line(s) to line(s) ± 1 kV differential
mode
Voltage dips, short
interruptions and
voltage variations on
power supply input
lines
IEC 61000-4-11
<5% UT
<5% UT
70% UT
70% UT
(30% dip in UT) for 25
cycles
(30% dip in UT) for 25
cycles
<5% UT
<5% UT
(>95% dip in UT) for 5
seconds
(>95% dip in UT) for 5
seconds
3A/m
3A/m
Power frequency
(50Hz) magnetic field
IEC 61000-4-8
Mains power quality should be that of a typical
commercial or hospital environment.
Mains power quality should be that of a typical
commercial or hospital environment. If the user
(>95% dip in UT) for 0.5 (>95% dip in UT) for 0.5 of the Welch Allyn Home Scale requires
cycle
cycle
continued operation during power mains
interruptions, it is recommended that the
Welch Allyn Home Scale be powered from an
40% UT
40% UT
uninterruptible power supply or a battery.
(60% dip in UT) for 5 (60% dip in UT)for 5
cycles
cycles
Power frequency magnetic fields should be at
levels characteristic of a typical location in a
typical commercial or hospital environment.
Note: UT is the AC mains voltage prior to application of the test level.
Electromagnetic immunity
The Welch Allyn Home Scale is intended for use in the electromagnetic environment specified below. The customer or
the user of the Welch Allyn Home Scale should assure that it is used in such an environment.
18
Appendices
Welch Allyn Home™ Scale
Electromagnetic immunity
Immunity test
IEC 60601 test level
Compliance level
Electromagnetic environment - guidance
Portable and mobile RF communications
equipment should be used no closer to any part
of the Welch Allyn Home Scale, including
cables, than the recommended separation
distance calculated from the equation
applicable to the frequency of the transmitter.
Recommended separation distance
Conducted RF
IEC 61000-4-6
3 Vrms
150 kHz to 80 MHz
3 Vrms
Radiated RF
IEC 61000-4-3
3 V/m 80 MHz to 1 GHz 3 V/m
d= (1.167)
d= (1.167)
80 to 800 MHz
d= (2.333)
800 MHz to 2,5 GHz
whereP is the maximum output power rating of
the transmitter in watts (W) andd is the
recommended separation distance in meters
(m). Field strengths from fixed RF transmitters,
as determined by an electromagnetic site
surveya, should be less than the compliance
level in each frequency rangeb. Interference
may occur in the vicinity of equipment marked
with the following symbol:
Note1: At 80 MHz and 800 MHz, the higher frequency range applies.
Note 2: These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and
reflection from structures, objects, and people.
aField strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land mobile
radios, amateur radio, AM and FM radio broadcast, and TV broadcast cannot be predicted theoretically with accuracy. To
assess the electromagnetic environment due to fixed RF transmitters, an electromagnetic site survey should be
considered. If the measured field strength in the location in which the Welch Allyn Home Scale is used exceeds the
applicable RF compliance level above, the Welch Allyn Home Scale should be observed to verify normal operation. If
abnormal performance is observed, additional measures may be necessary, such as reorienting or relocating the Welch
Allyn Home Scale.
bOver the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
Recommended separation distances between portable and mobile RF communications
equipment and the Welch Allyn Home Scale
The Welch Allyn Home Scale is intended for use in an electromagnetic environment in which radiated RF disturbances
are controlled. The customer or user of the Welch Allyn Home Scale can help prevent electromagnetic interference by
maintaining a minimum distance between portable and mobile RF communications equipment (transmitters) and the
Welch Allyn Home Scale as recommended below, according to the maximum output power of the communications
equipment.
Appendices
Directions for use
19
Recommended separation distances between portable and mobile RF communications
equipment and the Welch Allyn Home Scale
Separation distance according to frequency of transmitter (m)
150 kHz to 80 MHz
Rated max. output
power of transmitter d= (1.167)
(W)
80 MHz to 800 MHz
800 MHz to 2.5 GHz
d= (1.167)
d= (2.333)
0.01
0.167
0.167
0.233
0.1
0.369
0.369
0.738
1
1.167
1.167
2.333
10
3.690
3.690
7.338
100
11.67
11.67
23.33
For transmitters rated at a maximum output power not listed above, the recommended separation distanced in meters
(m) can be estimated using the equation applicable to the frequency of the transmitter, where P is the maximum output
power rating of the transmitter in watts (W) according to the transmitter manufacturer.
Note 1: At 80 MHz and 800 MHz, the separation distance for the higher frequency range applies.
Note 2: These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and
reflection from structures, objects, and people.
Warranty
Welch Allyn will warranty the Home Scale to be free of defects in material and
workmanship and to perform in accordance with manufacturer specifications for the
period of two years from the date of retail purchase.
The warranty period shall start on the date of purchase. The date of purchase is: 1) the
invoiced ship date if the device was purchased directly from Welch Allyn, 2) the date
specified during product registration, 3) the date of purchase of the product from a
Welch Allyn authorized distributor as documented from a receipt from said distributor.
This warranty does NOT cover damages caused by misuse or abuse, including but not
limited to:
•
Failure caused by unauthorized repairs or modifications
•
Damage caused by shock or dropping during transportation
•
Damage caused by improper use of the power supply
•
Failure caused by improper operation not consistent with the instructions stated in
this Directions for use
Should this device require maintenance (or replacement at our option) under warranty,
please deliver the original package to Welch Allyn prepaid. Please return the store receipt
(with the retail purchase date) and a note with the reasons for the return.
20
Appendices
Welch Allyn Home™ Scale
Approved accessories
Item
Description
RPM-SCALEACC-01 Carpet Feet 40EA